These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Venezuela's President Hugo Chavez arrives to vote on a constitutional amendment referendum at a polling station in Caracas Sunday Feb. 15, 2009. Chavez, already a decade in power, is trying for a second time to win the right to seek re-election far into the future with a referendum Sunday. (AP Photo/Fernando Llano) (Fernando Llano - AP) Supporters of Venezuela's President Hugo Chavez ride along the streets of Caracas Sunday, Feb. 15, 2009.